Beyonce documentary to premiere Saturday on HBO

Beyonce and Oprah Winfrey address audience at the New York premiere of new… (Larry Busacca / Getty Images )

Beyonce says that HBO's new documentary, “Beyonce: Life Is But a Dream,” was the outgrowth of her sense that despite more than a dozen years in the public spotlight, first with the group Destiny’s Child then as a breakout solo performer who has become one of the pop music world’s biggest stars, “people didn’t know who I was.”

The film, which premieres Saturday on the cable channel, examines the artist's life and touches on several topics that she hasn’t discussed previously in public, which the singer said she found to be cathartic.

"This movie has really been my therapy,” the 31-year-old singer said at the film’s New York premiere screening Tuesday night. “I've healed from so many wounds... and hopefully I can inspire other people.”

That sentiment extends to Blue Ivy, the daughter born last year to Beyonce and hubby Jay-Z.

“I'm hoping that ... it can comfort her and inspire her in her life when she needs it,” she told the Associated Press.

In the film she talks about taking over management of her career from her father, Matthew Knowles, who had been guiding her life since childhood.

“When you’re trying to have an everyday conversation with your family you have to talk about scheduling and you have to talk about your album and performing and touring,” she says in the film. “It’s just too stressful and it really affects your relationship.”

She also addressed what she describes as “the most ridiculous rumor” she ever faced, that she used a surrogate mother to carry a child after her previous miscarriage.

“I respect mothers and women so much and to be able to experience bringing a child into the world – if you’re lucky and fortunate enough to experience that – I would never take that for granted,” she said. “Especially after losing a child, the pain and trauma from that just makes it mean so much more to get an opportunity to bring a life into the world. It’s something you have to respect. … There’s certain things you just shouldn’t play around with and a child, you don’t play around with that.”